Changing default audio source changes the recording audio source

Bug #1694294 reported by Alfonso Rodríguez on 2017-05-29
This bug affects 1 person
Affects Status Importance Assigned to Milestone
unity-control-center (Ubuntu)

Bug Description

Description: Ubuntu 16.04.2 LTS
Release: 16.04
  Installed: 15.04.0+16.04.20160705-0ubuntu1

Expected Behaviour: When I start a recording with a specific audio source, changing the default audio source has no effect on the recording source.

Actual Behaviour: The audio source changes to the default one always, even if I specified one before.

So far I tried this using parecord and gstreamer. After I start a recording, if I go to Sound > Input and change the source in the "Record sound from" box, the recording source changes.

This happens even when I specify a device explicitly. Examples:

GStreamer: gst-launch-1.0 pulsesrc device=alsa_input.pci-0000_00_1b.0.analog-stereo ! pulsesink
pulse: parecord --file-format="wav" -d alsa_input.pci-0000_00_1b.0.analog-stereo TEST.WAV

In both cases, changing the source in the config changes the audio being recorded.

I thought this was a pulse issue, but changing the default source with pactl does not have this behaviour (and the change does appear in the sound control panel)
How to change the default audio source with pactl:

pactl set-default-source alsa_input.usb-046d_081d_96D1FD90-00.analog-mono

I suspect this has something to do with how the control center changes the default audio source, so a clarification in how this happens could be very helpful.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-control-center 15.04.0+16.04.20160705-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon May 29 17:53:48 2017
ExecutablePath: /usr/bin/unity-control-center
InstallationDate: Installed on 2016-06-17 (346 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: unity-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

The same happens if I use the gnome-control-center

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